The human eye is an organ which reacts to light for several purposes. As a conscious sense organ, the eye allows vision. Rod and cone cells in the retina allow conscious light perception and vision including color differentiation and the perception of depth. The human eye can distinguish about 10 million colors.[1] In common with the eyes of other mammals, the human eye's non-image-forming photosensitive ganglion cells in the retina receive the light signals which affect adjustment of the size of the pupil, regulation and suppression of the hormone melatonin and entrainment of the body clock.

The eye is not properly a sphere, rather it is a fused two-piece unit. The smaller frontal unit, more curved, called the cornea is linked to the larger unit called the sclera. The corneal segment is typically about 8 mm (0.3 in) in radius. The sclera constitutes the remaining five-sixths; its radius is typically about 12 mm. The cornea and sclera are connected by a ring called the limbus. The iris – the color of the eye – and its black center, the pupil, are seen instead of the cornea due to the cornea's transparency. To see inside the eye, an ophthalmoscope is needed, since light is not reflected out. The fundus (area opposite the pupil) shows the characteristic pale optic disk (papilla), where vessels entering the eye pass across and optic nerve fibers depart the globe.

How to take care of our eyes?

Do s:
* Make it a habit to clean your eyes daily.
* In order to avoid eye fatigue, only read under sufficient and uniform illumination. * Rest your eyes for a while if they feel tired.
* Keep away from the targets of darts and arrows.
* Walk, don't run, when holding sharp object, keep the point turned down. * Watch out for pointy things, such as tree branches.
* Wear eye safety equipment when playing eye hazardous sports * Wear safety goggles when engaged in eye hazardous chores. * Wear prescription glasses, if needed, with polycarbonate...

YOU MAY ALSO FIND THESE DOCUMENTS HELPFUL

...COW EYE DISSECTION
Use the following link to watch a video on a cow’s eye dissection.
http://www.exploratorium.edu/learning_studio/cow_eye/video_sm_all.html
Aim: The purpose for a cow’s eye dissection is to learn the different parts of the eye by doing a hands on experiment. You can always see the eye from images or diagrams, but this experiment helps you get a better visual and feel of an eye.
Materials:
* Scalpel
* Scissors
* Newspaper
* Cows eye
Method:
1. Examine the outside of the eye. You should be able to find the sclera, the tough, outer covering of the eyeball. In humans, the sclera is the whites of the eyes, on a preserved cow eye; this area may appear dark brown. You should also be able to identify the fat and muscle surrounding the eye. Locate the covering over the front of the eye (the cornea). When the cow was alive, the cornea was clear. In your cow’s eye, the cornea may be cloudy or blue in colour.
2. Cut away the fat and muscle, this may only be necessary if fat is covering the cornea of the eye and is in your way. Fat around the backside of the eye can be left alone. Flip the eye over to find the optic nerve where it exits out the back of the eye. It will be stronger...

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HumanEye vs. Camera Lens
Prof. Richard B. Baber
The Art Institute of Tampa
ENC-2210, Section A
November 05, 2013
Abstract
Being a photographer I have slowly started to notice similarities between how we see things and how a camera sees things. My research paper will be on just how similar our eyes operate compared to the lens on a camera body. What are the exact similarities and differences between thehumaneyes and a camera lens and in general terms, how a camera processes images and how our brain processes images? From a photographer’s shoes, knowing the similarities can help to understand what each setting does in a camera and lens. From an average persons stand point, it can help to understand how exactly the eyes work compared to a camera lens. The methods of research used to gain knowledge about my subject are Internet, print media, and professional journals. The humaneyes and a camera lens have an unbelievable amount of similarities while they also have a decent amount of differences. The humaneyes and a camera lens have a lot of the same capabilities but when it comes to processing, it gets really different. Processing and recording images is a much different process when comparing the two. On the other hand, when we break down them both, we find a ton of similarities in components...

...The Eye is the organ of sight. Eyes enable people to perform daily tasks and to learn about the world that surrounds them. Sight, or vision, is a rapidly occurring process that involves continuous interaction between the eye, the nervous system, and the brain. <br><br>When someone looks at an object, what he/she is really seeing is the light that the object reflects, or gives off. This reflected light passes through the lens and falls on to the retina of the eye. Here, the light induces nerve impulses that travel through the optic nerve to the brain, where it makes an image of the object, and then that image is passed on to muscles and glands.<br><br>The eye is well protected. It lies within a bony socket of the skull. The eyelids guard it in front. They blink an average of once every six seconds. This washes the eye with the salty secretion from the tear, or lachrymal, glands. Each tear gland is about the size and shape of an almond. These glands are located behind the upper eyelid at the outer corner of the eye. After passing over the eye, the liquid from the gland is drained into the nose through the tear duct at the inner corner of the eye.<br><br>Heavy laughter or crying causes muscles in the upper eyelid to squeeze the lachrymal gland. This produces tears that flow too fast to be drained away. The eyelashes catch many flying particles that...

...YOGA FOR EYE SIGHT IMPROVEMENT
Published by Swami Vivekananda Yoga Prakashana #19, Eknath Bhavan, Gavipuram Circle, Kempegowda Nagar, Bengaluru - 560019 City Office - Ph: 080-26612669 Telefax: 080-26608645 Prashanti Kutiram Campus - Ph: 080-22639996 E mail: svyasa@svyasa.org Web: www.svyasa.org
Contents
Ch.no. 1 2 Introduction Body Systems in Improving Physical Stamina 3 4 5 Physiology of Muscle Action Physical Stamina According to Yoga Yoga Practices for Physical Stamina Development title Page no.
Yoga for Eye Sight Improvement | 7
IntRoDUCtIon
The great master Swami Vivekananda said that there are four main streams of yoga:Jnana Yoga, Raja Yoga, Bhakti Yoga and Karma Yoga. To use all these streams of yoga to build the personality. We are now going to focus on Eyesight Development or Eyesight Improvement. In late 60s the TV came afresh in Bangalore city and everybody was so fascinated, particularly the children glued themselves to TV forgetting all their sports outside. Went on watching 3 hours, 4 hours, 5 hours, 6 hours and movies after movies and as expected it started happening in 5 or 6 years, 1972-73 we started seeing most of these children wearing very thick glasses. We felt too bad. We said can we solve this problem? Many people said that we are not going to allow our children to watch the TV. That is no solution. This is when we started developing yoga module. The specialised techniques that yoga prescribes for...

...There Blind Spots in Our Eyes?
ABSTRACT
Our eyes are vital organs because they help us visualize our surroundings. But are our eyes perfect in seeing what’s right in front of us? Sadly I learned in our evolution, nature messed up at one point and gave us blind spots in our eyes. This project shows why we have these blind spots, how to discover them, and how big they are. I researched on how our eyes see things; why when one eye is closed, the other eye sometimes can’t see what’s in front of it. I also found during my research a formula that is used to estimate the size of a human eye’s blind spot. I performed an experiment using Blind Spot Test card I made to verify the existence of blind spots in my eyes. I also collected data while testing to find the size of my blind spot. I learned the size of eyes’ blind spots varies in relation to the size of the humaneyes.
QUESTION
Are there any blind spots in our eyes? If there are, how do we find them, and how big are they?
VARIABLES
Dependent Variable: Size of the blind spot in our eye
Independent Variable: Diameter of the eye
Experimental Group Controlled Variables For Each Group
Child Test Subject Me
Adult Test Subject My Mom
HYPOTHESIS
If I close one of my eyes, using a test...

...﻿The humaneye is the organ which gives us the sense of light allowing us to learn more about the surrounding world than any of the other five senses. We use our eyes in almost everything we do whether reading,working
watching television ,writing a letter driving a car and countless other activities
The eye allows us to see and interpret the shapes, colors, and dimensions of objects in the world by processing the light they reflect of give off.
Aqueous humor
clear watery fluid found in the anterior chamber of the eye; maintains pressure and nourishes the cornea and lens
Vitreous humor
clear, jelly-like fluid found in the back portion of the eye: maintains shape of the eye and attaches to the retina
Blind spot
small area of the retina where the optic nerve leaves the eye: any image falling here will not be seen
Ciliary muscles
involuntary muscles that change the lens shape to allow focusing images of objects at different distances
Cornea
transparent tissue covering the front of the eye: does not have blood vessels; does have nerves
Cones
photoreceptors responsive to color and in bright conditions; used for fine detail
Rods
photoreceptors responsive in low light conditions; not useful for fine detail
Fovea
central part of the macula that provides sharpest vision; contains only cones
Iris
circular band of muscles that controls the...

...﻿INTRODUCTION
The humaneye is one of the most complex organisms in the human body – second only to the brain. It is the organ which gives us the sense of sight, allowing us to observe and learn more about the surrounding world than we do with any of the other four senses. We use our eyes in almost every activity we perform, whether reading, working, watching television, writing a letter, driving a car, and in countless other ways. Most people probably would agree that sight is the sense they value more than all the rest. It can distinguish about 10 million colors. The eye allows us to see and interpret the shapes, colors, and dimensions of objects in the world by processing the light they reflect or emit. It is able to detect bright light or dim light, but it cannot sense an object when light is absent.
STRUCTURE OF THE EYEHumaneye are situated in the eyes sockets of the skull. The sockets give protection to the eyes. A number of muscles hold the eyes in place, enabling them to move in different directions. The eye is not shaped like a perfect sphere; rather it is a fused two-piece unit. The smaller frontal unit, more curved, called the cornea is linked to the larger unit called the sclera. The cornea and sclera are connected by a ring called the limbus. The dimensions differ among adults by only...

...Cow’s eye dissection
AIM ~
To locate and distinguish specific parts to an eye of a cow, in particular, its lens.
OBSERVATIONS ~
Before actually beginning the dissection of the cow’s eye, we were about to sketch a fairly relative picture of our observing’s of the exterior body of the eye. The eye, having almost completely being sheltered in fat and muscle, was quite firm and only the cornea and optic nerve was identified. By further cutting down the fat, we were able to spot a rather tough pinkie white outer covering of the eyeball, which we later discovered to be known as the sclera. We also noticed the blue covering over the front of the eye, known as the cornea, which became cloudy after death. Finally beginning the dissection, we made an incision in between the sclera and cornea which took much effort as it was quite tough. However once slit, a clear liquid named the aqueous humour was able to ooze out. Dissecting further, we were able to remove the lens, the iris and the pupil. The iris, suspended between the cornea and lens, came out as a rather brown coloured circle. The pupil, distinguished as the dark circle in the centre of the iris was rather quite oval. The lens was a tiny blob of white which resembled an ice capsule but however had a rather pasty soft, smooth and easily damaged texture. When splitting the eye in half, we were able to discover its rather...